I Have downloaded the ethernet code from code bundle.zip it is working properly but iam unable to trace the IP address of the board.So please any one help me to identify the IP address of the evaluation board of LPC2378
Sounds like you need to spend some time to get up to speed with the basics of TCP/IP?
eg, see: compnetworking.about.com/.../TCPIP_Transmission_Control_Protocol_Internet_Protocol.htm